package de.fub.bytecode.util;

import de.fub.bytecode.classfile.*;
import java.io.*;

/**
 * Convert methods and fields into HTML file.
 *
 * @version $Id: MethodHTML.java,v 1.1.1.1 2000/08/10 16:05:07 cvs Exp $
 * @author  <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
 * 
 */
final class MethodHTML implements de.fub.bytecode.Constants {
  private String 	class_name;     // name of current class
  private PrintWriter	file;	        // file to write to
  private ConstantHTML  constant_html;
  private AttributeHTML attribute_html;

  MethodHTML(String dir, String class_name,
	     Method[] methods, Field[] fields,
	     ConstantHTML constant_html, AttributeHTML attribute_html) throws IOException
  {
	this.class_name   	= class_name;
	this.attribute_html = attribute_html;
	this.constant_html  = constant_html;

	file = new PrintWriter(new FileOutputStream(dir + class_name + "_methods.html"));

	file.println("<HTML><BODY BGCOLOR=\"#C0C0C0\"><TABLE BORDER=0>");
	file.println("<TR><TH ALIGN=LEFT>Access&nbsp;flags</TH><TH ALIGN=LEFT>Type</TH>" +
		 "<TH ALIGN=LEFT>Field&nbsp;name</TH></TR>");
	for(int i=0; i < fields.length; i++)
	  writeField(fields[i]);
	file.println("</TABLE>");
	
	file.println("<TABLE BORDER=0><TR><TH ALIGN=LEFT>Access&nbsp;flags</TH>" +
		 "<TH ALIGN=LEFT>Return&nbsp;type</TH><TH ALIGN=LEFT>Method&nbsp;name</TH>" +
		 "<TH ALIGN=LEFT>Arguments</TH></TR>");
	for(int i=0; i < methods.length; i++)
	  writeMethod(methods[i], i);
	
	file.println("</TABLE></BODY></HTML>");
	file.close();
  }  
  /**
   * Print field of class.
   *
   * @param field field to print
   * @exception java.io.IOException
   */
  private void writeField(Field field) throws IOException {
	String       type	= Utility.signatureToString(field.getSignature());
	String       name   = field.getName();
	String       access = Utility.accessToString(field.getAccessFlags());
	Attribute[]  attributes;

	access = Utility.replace(access, " ", "&nbsp;");

	file.print("<TR><TD><FONT COLOR=\"#FF0000\">" + access + "</FONT></TD>\n<TD>" +
	       Class2HTML.referenceType(type) + "</TD><TD><A NAME=\"field" + name + "\">" +
	       name + "</A></TD>");
					
	attributes = field.getAttributes();

	// Write them to the Attributes.html file with anchor "<name>[<i>]"
	for(int i=0; i < attributes.length; i++)
	  attribute_html.writeAttribute(attributes[i], name + "@" + i);

	for(int i=0; i < attributes.length; i++) {
	  if(attributes[i].getTag() == ATTR_CONSTANT_VALUE) { // Default value
	String str = ((ConstantValue)attributes[i]).toString();

	// Reference attribute in _attributes.html
	file.print("<TD>= <A HREF=\"" + class_name + "_attributes.html#" +
		   name + "@" + i + "\" TARGET=\"Attributes\">" + str + "</TD>\n");
	break;
	  }
	}
	
	file.println("</TR>");
  }  
  private final void writeMethod(Method method, int method_number) throws IOException {
	// Get raw signature
	String       signature 	= method.getSignature();
	// Get array of strings containing the argument types 
	String[]     args      	= Utility.methodSignatureArgumentTypes(signature, false);
	// Get return type string
	String       type  		= Utility.methodSignatureReturnType(signature, false);
	// Get method name
	String       name      	= method.getName(), html_name;
	// Get method's access flags
	String       access    	= Utility.accessToString(method.getAccessFlags());
	// Get the method's attributes, the Code Attribute in particular
	Attribute[]  attributes	= method.getAttributes();

	/* HTML doesn't like names like <clinit> and spaces are places to break
	 * lines. Both we don't want...
	 */
	access 	= Utility.replace(access, " ", "&nbsp;");
	html_name 	= Class2HTML.toHTML(name);

	file.print("<TR VALIGN=TOP><TD><FONT COLOR=\"#FF0000\"><A NAME=method" + method_number + ">" +
	       access + "</A></FONT></TD>");

	file.print("<TD>" + Class2HTML.referenceType(type) + "</TD><TD>" +
	       "<A HREF=" + class_name + "_code.html#method" + method_number +
	       " TARGET=Code>" + html_name + "</A></TD>\n<TD>(");

	for(int i=0; i < args.length; i++) {
	  file.print(Class2HTML.referenceType(args[i]));
	  if(i < args.length - 1)
	file.print(", ");
	}

	file.print(")</TD></TR>");

	// Check for thrown exceptions
	for(int i=0; i < attributes.length; i++) {
	  attribute_html.writeAttribute(attributes[i], "method" + method_number + "@" + i,
				    method_number); 

	  byte tag = attributes[i].getTag();
	  if(tag == ATTR_EXCEPTIONS) {
	file.print("<TR VALIGN=TOP><TD COLSPAN=2></TD><TH ALIGN=LEFT>throws</TH><TD>");
	int[] exceptions = ((ExceptionTable)attributes[i]).getExceptionIndexTable();
	
	for(int j=0; j < exceptions.length; j++) {
	  file.print(constant_html.referenceConstant(exceptions[j]));
	  
	  if(j < exceptions.length - 1)
	    file.print(", ");
	}
	file.println("</TD></TR>");
	  } else if(tag == ATTR_CODE) {
	Attribute[] c_a = ((Code)attributes[i]).getAttributes();

	for(int j=0; j < c_a.length; j++)
	  attribute_html.writeAttribute(c_a[j], "method" + method_number + "@" + i + "@" + j,
					method_number); 
	  }
	}
  }  
}